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1999 Chevrolet Astro

Question: where is the MAP switch located?And how do you replace it?

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mueller60513, 4.3L V6, Brookfield, IL, January 25, 2012, 10:47
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OBD code is P0101 The van will not accelerate and shift properly. It's fine in park or neutral when accelerating

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  • Answer #1

    Greg's Orange Auto (4512 Answers) , Orange, CA - (714) 769-6971
    globalhelper January 25, 2012, 12:57
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    CK YOUR WIRING TO THE MASS AIR FIRST. IT IS EITHER MOUNT ON A BRACKET WITH 3 WIRES GOING TO IT ALONG WITH 1 VAC HOSE, OR ITS IN THE INTAKE MANIFOLD WITH 3 WIRES AND NO VAC SOURCE TO IT. DEPENDING ON WHAT KIND OF INJECTION SYSTEM YOU MAY HAVE

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    mueller60513, January 25, 2012, 18:00
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    I've just tried cleaning the MAF SENSOR, and after re-install,van accelerates better. However still not right.
    Tested wiring at the 3 wire plug to the MAF with voltage at the black wire around 9 volts &red at -5

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    globalhelper, January 25, 2012, 20:02
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    well your on the right track. you need a pwr wire a grd wire and a 5v ref signal. if you can't do that try a sensor if cleaning helped a new one may be the answer

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